Kaley Cuoco is starting 2014 as a married woman! The Big Bang Theory star tied the knot with Ryan Sweeting on Tuesday, Dec. 31, in a romantic New Year's Eve wedding in Southern California, her rep confirms to Us Weekly.

The actress, 27, and her tennis pro beau, 26, said "I do" at the Hummingbird Nest Ranch. Guests trickled in at 7 p.m., as Cuoco greeted them in a red dress, an insider tells Us. Before the nuptials began around 10 p.m., Cuoco changed into a petal pink Vera Wang gown.

"Yep :) #thesweetings @ryansweething," Cuoco wrote in the early hours via Instagram. Alongside the caption, the Big Bang star shared a sweet picture of the newlyweds kissing. Cuoco wore her strapless tulle Wang ball gown, which had a sweetheart neckline and detailed bodice with hand appliqué Chantilly lace accents.

Famous pals to attend the ceremony included her Big Bang costar and ex-boyfriend Johnny Galecki and Bachelorette alum Ali Fedotowsky, a source tells Us. (Cuoco and Galecki secretly dated for two years, and it was only after their split that Cuoco revealed about their past romance in September 2010.)

Us exclusively broke the news of Cuoco's engagement back in September, just three months after she and Sweeting started dating. "She knows Ryan is the one," a source told Us at the time. "When you know, you know."

Added another pal: "She's never felt this way. She knows this is it."

Indeed, the newly married star told Entertainment Tonight she felt an intense connection with Sweeting from the very beginning of their relationship. "From day one, I just knew immediately and it's been magic. We have all the same family friends. We grew up with the same people, we just never met," she explained a few days after their engagement. "So I kind of feel that I've known him my whole life."

"I know that it seems a little crazy on paper," she admitted. "But it's what works for us."

The couple wasted no time planning their nuptials, too. In November, Cuoco joked to Craig Ferguson that she had been imagining her wedding for 27 years. Among her big dreams for the big day?

"I'm obsessed with my dogs. And I wanted to do the cake in the shape of their heads," she confessed. "I might ride in on one of my horses," she added, laughing. "I secretly kinda want to do that. I'm a big animal freak. I'd rather the animals be there than real people."